EP 0159837 B1 19911211 - STIMULATION OF OIL AND GAS WELLS WITH PHOSPHATE ESTER SURFACTANTS
Title (en)
STIMULATION OF OIL AND GAS WELLS WITH PHOSPHATE ESTER SURFACTANTS
Publication
Application
Priority
US 60141384 A 19840418
Abstract (en)
[origin: US4541483A] Crude oil and gas production wells, which no longer produce oil or gas utilizing conventional primary and secondary means of recovery, can be returned to production by treatment comprising addition of a non-aqueous solution of certain phosphate ester surfactants followed by successive treatment with water or a hydrocarbon. Increased production also can be obtained in low-producing oil and gas wells by similar treatment with certain phosphate ester surfactants. Subsequent to treatment of a producer well, the phosphate ester surfactant is forced into the formation utilizing water or a hydrocarbon and said surfactant is allowed to remain in the producing well, for an effective period of at least 12 hours. Thereafter, pumping and/or conventional fluid drive means are then utilized to recover oil or gas from the subterranean oil or gas formation. The amount of non-aqueous surfactant solution utilized is sufficient to permeate the oil or gas subterranean formation in the area immediately adjacent to the producing well bore and up to a radius therefrom of about 20 feet.
IPC 1-7
IPC 8 full level
C09K 8/82 (2006.01); C09K 8/86 (2006.01); E21B 43/22 (2006.01); E21B 43/25 (2006.01)
CPC (source: EP US)
C09K 8/82 (2013.01 - EP US); C09K 8/86 (2013.01 - EP US); Y10S 507/93 (2013.01 - EP US); Y10S 507/931 (2013.01 - EP US); Y10S 507/935 (2013.01 - EP US); Y10S 507/936 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
US 4541483 A 19850917; AT E70335 T1 19911215; CA 1221620 A 19870512; DE 3584849 D1 19920123; EP 0159837 A2 19851030; EP 0159837 A3 19860205; EP 0159837 B1 19911211
DOCDB simple family (application)
US 60141384 A 19840418; AT 85302301 T 19850402; CA 477570 A 19850326; DE 3584849 T 19850402; EP 85302301 A 19850402